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Laptop displays blank F9 boot screen when USB 3.0 thrumb drive is in a port

HP Recommended
Probook 640 G4
Microsoft Windows 10 (64-bit)

I would like to boot from a USB 3.0 thumb drive.  I have the secure boot feature turned off.  When the F9 boot screen comes up it is blank when a bootable USB 3.0 thumb drive is in any USB port.

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